A simple structure optical fiber sensor for relative humidity(RH) and temperature measurement is proposed and verified in this paper, which is based on graphene oxide quantum dots and polyvinyl alcohol(GOQDs-PVA) comp...A simple structure optical fiber sensor for relative humidity(RH) and temperature measurement is proposed and verified in this paper, which is based on graphene oxide quantum dots and polyvinyl alcohol(GOQDs-PVA) composite coated tapered no-core fiber(NCF) combined with a fiber Bragg grating(FBG). FBG is insensitive to humidity and sensitive to temperature, which is used to compensate temperature of the sensor. Experimental results show this sensor has humidity sensitivity of 143.27 pm/%RH ranging from 30%RH to 80%RH and the temperature sensitivity of 9.21 pm/℃. The proposed sensor has advantages of simple structure, good repeatability, and good stability, which is expected to be used in both RH and temperature measurement in biological and chemical fields.展开更多
A structure of optical arbitrary waveform generation(OAWG)based on an array of tunable apodized waveguide Bragg gratings(WBGs)is proposed.The WBGs array on lithium niobate(LN)consists of several apodized gratings,wave...A structure of optical arbitrary waveform generation(OAWG)based on an array of tunable apodized waveguide Bragg gratings(WBGs)is proposed.The WBGs array on lithium niobate(LN)consists of several apodized gratings,waveguides and electrodes deposited on both sides of gratings and waveguides.The properties of OAWG are analyzed using transfer matrix method.Due to the electro-optic effect of LN,the amplitude and phase of incident light source are controlled via adjusting the voltages on electrodes.Consequently,the optical pulses with different waveforms are obtained and the amplitude is linearly tuned.In addition,voltages compensating amplitude and phase distortion are demonstrated.展开更多
基金supported by the National Natural Science Foundation of China (No.61377075)the Training Program for Leading Talents of Universities in Tianjin。
文摘A simple structure optical fiber sensor for relative humidity(RH) and temperature measurement is proposed and verified in this paper, which is based on graphene oxide quantum dots and polyvinyl alcohol(GOQDs-PVA) composite coated tapered no-core fiber(NCF) combined with a fiber Bragg grating(FBG). FBG is insensitive to humidity and sensitive to temperature, which is used to compensate temperature of the sensor. Experimental results show this sensor has humidity sensitivity of 143.27 pm/%RH ranging from 30%RH to 80%RH and the temperature sensitivity of 9.21 pm/℃. The proposed sensor has advantages of simple structure, good repeatability, and good stability, which is expected to be used in both RH and temperature measurement in biological and chemical fields.
基金the National Natural Science Foundation of China(No.61377075)the Tianjin Natural Science Foundation(No.17JCYBJC16600).
文摘A structure of optical arbitrary waveform generation(OAWG)based on an array of tunable apodized waveguide Bragg gratings(WBGs)is proposed.The WBGs array on lithium niobate(LN)consists of several apodized gratings,waveguides and electrodes deposited on both sides of gratings and waveguides.The properties of OAWG are analyzed using transfer matrix method.Due to the electro-optic effect of LN,the amplitude and phase of incident light source are controlled via adjusting the voltages on electrodes.Consequently,the optical pulses with different waveforms are obtained and the amplitude is linearly tuned.In addition,voltages compensating amplitude and phase distortion are demonstrated.